Problem: Whitefly (Jasmine)
This insect is a common pest of many garden and greenhouse plants. The four-winged adult lays eggs on the undersides of leaves. The larvae are flat, oval, and semitransparent. They feed for about a month before changing to the adult form. Both larval and adult forms suck sap from the leaves. The larvae are more damaging because they feed more heavily. Adults and larvae cannot fully digest all the sugar in the plant sap, and they excrete the excess in a fluid called honeydew, which often drops onto the leaves below. A sooty mold fungus may develop on the honeydew. In warm-winter areas these insects can be active year-round.
Remove heavily infested leaves. Vacuum plants to pick up adults. Apply an insecticide labeled for edibles, or houseplants if grown indoors, following label instructions. Treat plants at night when insects are not flying. Continue treatment if the problem continues.